Our communication landscape in 2011 is not just one where information is "pushed" to others with technologies like email. It is also characterized by "pull" technologies which allow people to (among other things) create customized digital newspapers that combine multiple information sources.
This 3 min, 45 second video (RSS in Plain English) provides a nice overview of RSS.
Review the WikiPedia article for "web feed" for additional background information.
Many different tools are available which serve as "aggregators" to collect and display web feeds. Review the WikiPedia article for "news aggregator" for a lengthier definition. Some include:
Google Reader in Plain English (1 min, 6 sec) provides a great overview of Google Reader
How to Subscribe to a Website as a Channel in Google Reader, and Categorize / Organize it in a Folder
Web-based aggregators permit users to access them from any web browser, as well as a number of third party mobile applications. Google Reader is a flexible, web-based news aggregator / feed reader which is integrated into various third-party mobile apps as well as websites. Some examples include: